Boom hoist for cranes



3 Sheets-Sheet 1 Aug. 18, 1936.

E. B. NICKLES BooM HoIsT FOR cRANEs 5 sheets-sheet 2 Filed April 27,1932 l nl l i O J Aug. 1s, 1936. E. B. NICKLES 2,051,388

BOOM HOIST FOR CRANES Patented Aug. 18, 1936 :BOOM HOIST FOR GRANES.,EdwardB. Nickles, Manitowoc,Wis., assignorrto Manitowoc Shipbuilding'Corporation, Manitowoc, Wis.,-a corporation (if-'Wisconsinll'Applicationf'April 27, 1932, Serial No. 607,777

*2 "Claims and third, providing for the-.use of a relatively longerboom, thus correspondingly increasing the operatingrange or` radiusoi?.Y the machine.

In accorda-nce. .with myinvention, I attain the object thereofbyshifting the hitch or anchorage 4of the cableforiraisinggand loweringthe-boom fromthe top of .the A-frame, or from the top of a gantry whichextends a considerable distance -above the ,top of .the cab,;in[accordance With .common present; practice, to .ai position atthe rearendotthe .topof the caband in providing-a suitable lSupport lto .which,the-` booml operating cable isanChOHad- -and which will sustain the ;rstresses .producedinthe operation ofv said .-boom'hoist, all :ashereinafterully described.

,In `the.accompanying draw-ings,.in-which the invention isfullyillustrated,

Figlisasideview of- ,a cranethe boom `hoist v.of whichernbodies myyimproved rear hitch, said crane being shown asrappliecl inuseI foroperating ya `clam-shell bucket;

Fig. 2 is. anexterior rearview thereof, the boom and. associated,p,arts.being omitted;

Fig. 3 is an enlarged exterior rear vieu/.thereof showingframingfforfanchoring my improved rear hitch, the sheathingof the cabbeing removed in part.

Fig. 4 is a corresponding View of the framing for said boom hoist takenfrom a position in front of the A-frame, all operating parts beingomitted.

Fig. 4a is an enlarged fragmentary detail View on the line Abi- 4EL ofFig. 5.

Fig. 5 is a top plan View of the cab of the crane showing the frame forthe boom hoist, the roof sheathing of the cab being omitted; and

Fig. 6 is a side View of the framing shown in Fig. 5 with the sidesheathing of the cab removed.

Describing the invention with reference to the drawings, A designatesthe rotating platform of the crane as a whole, B the cab as a Whole, Cthe crawler on which the platform, cab and hoisting machinery aremounted, D the boom of the crane as a Whole, pivoted to the rotatingplatform at I,

a clam-:shell bucket,f2the cable,4 for supporting and operatingssaid,bucket,.-3\ indicates, diagram- 'matically,-.the bucket handling drum,F thee-boom y-hoistf as.-a-whole,.--and;-.4 indicates,ldiagrammatically,` the Adrum ordrums forv operating the boom 5 hoist;which,fas.shown,.is. rotatablymounted onta usualfAv-frame designatedasafwhole. G,.said drum -or drums, inz-accordance-With usual zpractice,lbeing :driven `from the .main :or jack nshaftv of .the machine.

.Asregards-.their usual .features andvexcepting as regards featureshereinafterparticularly de- .scrib-edsandfpointedsoutfallzof theforegoing parts areold.. andawell-.fknown .and lmay .be off-any. usual0.1' desiredoonstruction-and will'readil-y'be underl5 Stood. .bylpersons` familiar with. the. construction and, operation. of suchmachines without 1 a: vdescription thereofin detail.

.In.,accordance .with the-invention, the :hitch fortthescables 22 of..the boom.. hoist F, :instead `ofabeing-,rnade rdirectly. .tothefYAef-rame. GfY in. accordancewwith usual..priorfpracticefis made tobrackets,5..mountedat. the; top. of the rear` Wall .b 'of .the,cab,B,.nas.shown,seeFigs.,1,;2fand-6,. there-.by-1increasing..the..angular.,divergencegof the boom 25 D and thecables 22 of theboom '.hoistfF for a .boomer givenflength,Ycorrespondingly-increasing the .leverageexerted .by saidcablesconetheboom,

I.as will be readilyunderstood.

Inevhatl nowco-nsider preferable construction, 30 the rearwall ofthecab,in,ordery to provideadeq uate strength, is madeot boilerplate offsuitable `thickness.say .one-half. inch (1/) thick and is reinforcedandstrengthened- .bysuitable framing consisting, .as-shown,.oispaeedanglebars y(i rivet- 35 fedorntherwisesecured inupright,position vto the reanwalLol the. cabasecured.tothe..upper.ends of whichby gusset plates 1 are spaced parallel frame members 8 and crossed framemembers 9, the front ends of the members 8 being secured di- 40 rectlyto an angle I0 forming part of the A- frame, by clips or angles II, asshown, and the front ends of the cross members 9 being secured to themembers 8 adjacent the angle Il, by gusset plates I2.

As shown, the members 8 may be described as special channels, beingbuilt up and consisting of two angles I3 and I4, anges of which areriveted or otherwise rigidly secured together with their other anglesprojecting outwardly in the 50 same direction. Also, the crossed framemembers 9 consist of angles, a ange of one of which is secured to thetop sides of the gusset plates 'I and I2 and of the other, to theundersides of said gusset plates, whereby the attached sides 55 of saidcross members will be in substantially parallel planes and will bespaced a distance apart equal to the thickness of said gusset plates.

As shown, also, the angles 9 are rigidly connected together where theycross each other by a washer l5 riveted or otherwise rigidly secured tosaid angles.

The unconnected flanges of said crossed members 9 extend away from eachother, as shown, and will form webs which will impart great strengthV tothe frame structure of which they are constituent parts.

The top covering of the cab is made of sheet steel of suitablethickness-say No. 10 gaugethe edges thereof being bent downwardly overthe sides and ends of the cab and rigidly secured to the side and endplatesthereof, as by rivet- Ving or welding. Y

' As shown, also, the top covering ofY the cab is connected to the frontand rear end walls by angles vI6 shaped to fit into the angles at thejunctures of said top and said front and rear end walls, flanges of saidangles being secured Ato said top covering and front and rear'endwalls.- Also, as shown, the top covering of the cab` is reinforcedand'strengthened by a trans- Y verse angular member Il, one flange ofwhich is secured to said roof covering and the other of which extends atright angles thereto. Said transverse member is not continuous, however,

Y but is divided into separate sections by the reinforcingV members 8. Y

In accordance with my invention, also, the

bracing for the rear wall b of the cab also comprises vdiagonal hog-barsI8, opposite ends of which are connected to and which rigidly connectangle plates |79 anchored, respectively, to

VVthe platform A and the rear wall b of the cab,

Y rear wall b ofthe cab.

In accordance with common practice, also, the boom hoist F comprises twoYhoisting cables 22, each anchored to a separate bracket 5 by sets ofstraps 23, being shown as adjusted to a sheaveY 24 rotatably mountedbetween the outer ends of said pairsY of straps, respectively, saidstraps being of suchY length that when they are turned into theirlowermost position-defined by contact with the top of the cab-'thesheaves 24 will ,be positioned in front of the cab so that they willYbeefree to rotate in all operative positions of consider the preferableembodiment of the in-V vention, particularly as regards the bracing forreinforcing and supporting the back wall of the cab, this admits of awide range of modification and variation within the scope andcontempla--V tion of the invention. Y

For example, the bracing shown for reinforcing and strengthening therear wall of the cab to withstand the stresses to which it will besubjected in use, is only one of many forms of brac-V ing which might bedevised for the purpose and Y exemplifies any desired or approved formof bracing, of which, in practice, there probably would be as manydifferent designs as there might be designers.

An important advantage of my invention over the usual gantryconstruction is the low clearance 'Y height of the machine with a boomlowered when passing under over-head obstructions.

I claim: l

l. In a machine of the type specied, the combination ofra platform, aycab thereon, a boom pivoted to said platform, operating mechanismmounted on said platform,A including hoisting means for turning the boompivotally to raise and lower the free end thereof, comprising a hoistingcable or cables anchored to the top of the rear wall of the cab, andmeans for reinforcing the rear wall of the cab to withstand the stressesto whichit will be subjected in use, comprising a frame secured in xedYposition to the platform of the machine at a distance from said rearwall, and bracing which connects said frame with Ythe rear wall of thecab. y

2. In a machine of the type specified, the combination of a platform, acab thereon, a boom pivoted to said platform, operating mechanismmounted on said platform, including hoisting means for turning the boompivotally to raiseV Vand lower the free end thereof, comprising ahoisting cable or cables, anchored to the top of the rear wall of thecab, a frame secured in fixed position to the platform ofthe machine,bracing which connects said frame with the rear wall of the cab, and adiagonal bar or bars the Y

